Last Updated On [03-11-2023]
A lens when placed on a plane mirror then object needle and its image coincide at 
. The focal length of the lens is
.png)
|
a) |
15 |
b) |
30 |
c) |
20 |
d) |
|
Question ID - 152521 :- A lens when placed on a plane mirror then object needle and its image coincide at . The focal length of the lens is
a)
15 
b)
30 
c)
20 
d)
A lens when placed on a plane mirror then object needle and its image coincide at . The focal length of the lens is
|
a) |
15 |
b) |
30 |
c) |
20 |
d) |
|
(a)
.png)
When the object is placed at focus the rays are parallel. The mirror placed normal sends them back. Hence image is formed at the object itself as illustrated in figure
Next Question :
|
A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut-off all light coming out of water |
|||||||
|
a) |
Infinite |
b) |
6 m |
c) |
4 m |
d) |
3m |
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